Syringe



Jan. 12 1926.

. H. M. CARSTENS SYRINGE Filed March 24, 1924 Patented Jan. 12, 19 26.

UNlTE'D STATES PATENT OFFICE.

HENRY I. GARSTENSQOF OAK PARK, ILLINOIS.

SYRINGE.

Application flled'ltarch 24, 1924. Serial No. 701,302.

To all whom it may concern."

Be itknown that I, IIENRY M. CARSTENS, a citizen of the United States,and a resident of Oak Park, Cook County, and State of Illinois, haveinvented certain new and useful Im rovements in Syringes, of which thefollowing is declared to be afull, clear,

and exact description.

This invention relates to syringes, and in its present form, it has beendesigned espethe cylinder and the hollow needle of the syringe.

Another object is to provide a filling and discharge control device thatmay be readily attached to or removed from standard types of syringeshaving the proper threaded connection for the device.

Another object is to provide an adjustable stop collar for the plungerrod or s eeve of the syringe, which is of novel and improvedconstruction, capable of instant adjustment to any desired place on theplunger rod or sleeve, whereby predetermined measured doses may beinjected.

Another object is to provide a stop collar that may be freely adjustedin one direction by sliding it on the plunger rod or sleeve to thedesired place thereon, and having a ratchet like connection with theplunger rod or sleeve for preventing backward movement on said rod orsleeve, except when the ratchet like connection is released by the user.

With theseand other objects and advantages in view, this inventionconsists in the several novel features of construction, arrangement andcombination of parts, hereina ter fully set forth and claimed.

. The invention is clearly illustrated in the accompanying drawing, inwhich Fig. 1 is a-view, partlyin side elevation and partly in -central,longitudinal section, of a syringe, embodying a simple form of thepresent invention; Fig. 2 is a view, partly in side elevation and artlin cen tral, longitudinal section, of. t e fi g and discharge controldevice, showing the push plug thereof in depressed position; 'Fig. 3 1sa vertical section taken on the line 33 of Fig. 2; Fig. 4 is a detail,crosssection taken on the line 44 of Fig. 1; Fig. 5 is a detail, crosssection taken on the line 5-5' of Fig. 1 and Fig. 6 is a plan of afragment-' of-the plunger rod or sleeve and stop collar.

Referring to said drawing, which illustrates one embodiment of theinvention, the

reference character 10, designates the syringe cylinder, 11, theplunger, and 12 the.

plunger rod or sleeve, of a standard or commercial syringe of common andwell known construction. The cylindrical wall 13 of the cylinder isshown as formed of a, lass tube, and its ends are held against pac 'ngwashers by cylinder heads 14, 15, as is well understood. The head 14 hasa central aperture 16 through which the li uid is drawn into the.therefrom.

Removably secured on the cylinder head 14 is the filling and dischargecontrol device 17, the connection between the two cylinder and discarged 4 being here shown as comprising a threaded nipple 18, on the bodyportion 19 of the filling and discharge control device 17, and aninternally threaded boss 20 on the head 14. The threaded aperture 16isthe one above referred toas the one through which the liquid is drawninto the cylinder and discharged therefrom.

The body portion 19 of the fillin and discharge control device 17, isbored ongitudinally of itself and in the bore 21 is slidably mounted apush plug 22, which contains a lengthwise extending intake passage 23,which leads from its outerend 24, ,to a

point beyond the nipple 18, where the pas.

sage 23 terminates in allaterally extending a port 25, which is normallyclosedby the wall of the bore 21. Below the'port 2fi the push plug 22 isformed, with an annular groove 26,-; which forms. a passage, and inv thebody 19.;d're formed passages 27, 28, the

passage 27' leading from the bore 21 of thebody 19 to the interior ofthe cylinder 13,

and the passage 28 leading ,from the. bore 21 to and through a nipple 29formed on the f body 19, oppos te to the nipple 18. When innormal'position, as shown in Fig. 1, the

passage 26 of the push plug, connects the passa es 27,-28, whereby thecontents of the cylin er may be discharged whenever the plunger ispushed forward. Removably secured on the nipple 29 is a hollow needle 30such as is used for making injections under the skin, and said needlemay have a threaded connection with the nipple 29 as shown.

The body ortion 19 has packing glands 31, 32, threa edly secured onnipples at the opposite ends of the body, for making leak proof jointsbetween the body and push plug. One end of the push plug is providedwith a button or head 33 against'which the thumb of the user may bepressed to depress the push plug, and a coiled compression spring 34 isplaced between the gland 31 and button 33-, which acts to restore thepush plug to normal position after it has been depressed and released.The stroke of the push plug is limited by'a set screw 35 which isthreadedly secured in the body portion 19 and enters a groove 36 formedin the push plug; and .said screw and groove prevent rotation of thepush plug in the body portion. The screw 35 and slot connection 36 alsoact to stop the push plug at the places where the passage 26 and port 25register with the combined inlet and outlet passage 27. On the lower end24, of the push plug is secured a flexible filling tube 47 or othermeans for conveying liquid from a bottle or other container into thefilling and discharge control device.

The syringe is of the kind in which a measured quantit of its contentsmay be dischar d each time the plunger is pushed forwar and anadjustable stop collar.37 is provided on the lunger rod or sleeve 12 forengaging the-en of the head 15 and arresting movement of the plunger atthe place where a predetermined quantity has been discharged, said stopcollar and its connection with the rod or sleeve 12 are novel and willnow be described. The collar is transversely slotted and in the slot isa detent or dog 38 which is movable transversely of the rod or sleeveand surrounds the same. The detent has a tooth 39 formed at one edge ofits central opening 40 for engagement with any one of the rack teeth 41,which areformed on the lower side of the rod or sleeve 12.. The detent38 has a stem 42 on its upper end which extends out through a hole inthe collar and on the upper end of said stem is secured a knob 43 bywhich the detent may be depressed to disengage its tooth 39 from thetooth of the rack teeth'41 with which the detent is enged. A coiled.compression s ring 44 is interposed between the collar 3 and knob 43 andforces the tooth of the detent into enga ment with the rack teeth'on theunder-side of the rod or sleeve 12.- The rack teeth 41 and tooth 39 arebeveled, as shown, whereby the collar may be freely moved on the rodtoward the cylinder, but can only be moved back on the rod by firstdepressing before.

the knob 43 and disengaging the detent from the rack teeth of the rod12. The upper side of the rod 12 is flattened and the apertures in thecollar 37 and detent 38 have flat upper edges to correspond therewith.This arrangement prevents rotation of the collar on the rod. The flatface of the rod is provided with a graduated scale having scale marksand figures indicating quantities corresponding to the dose which is tobe discharged from the syringe at any time.

A palm rest 45 is secured on the free end of the plunger rod 12, and insome cases said palm rest forms a handle or knob for expanding thewashers of the plunger, but as this forms no part of the presentinvention, the details of said washers expanding device will not bedescribed in detail.

To fill the syringe, the stop collar 37 having been moved back towardthe palm rest, as far as it can go and the plunger 11.having been pushedto the' end of its discharge stroke, the filler tube 47 is inserted intothe bottle or other container for the serum orother fluid, the push plug22 depressed, and the plunger 11 drawn back to the end of its intake orsuction stroke. The push plug is then released. It will be noticed thatthe thumb of the hand holding the syringe. may be used for depressingthe push plug, while the other hand may be used for drawing back theplunger. When the push plug is depressed, communication is establishedbetween the intake passage 23 in the push plug 22, and the combinedinlet and outlet passage 27 in the body portion 19, which opens to thesyringe cylinder 13, and that when the push plug is released, the spring34 restores the push plug to normal position, shutting off communicationbetween the passages 23, 27, and establishing communication between thepassages 26,

27, 28 to the hollow needle 30.

The cylinder holds a suflicient amount of the fluid for several smalldoses and the amount of the first dose having been determined, the usersets the stop collar 37 at the proper mark, and this is done by slidinthe collar forward along the plunger r 12, the detent 38 passing freelyover the rack teeth 41 and snapping into the notch below the line wherethe collar is stopped. The syringe is then used by inserting the hollowneedle under the skin of the animal and the plunger rod 11 pushedforward until the collar 37 strikes againstthe end of the cylinder head.15. For injecting another dose the collar is moved back to the propergraduation mark, and the syringe used as It will also be observed thatthe normal position of the push plug is one in which the passage betweenthe cylinder .13 and needle 30 is continuously open, and that the act ofshifting the push plug 22 to establish ind I communicationbetween thecylinder and with one hand, leaving fillin tube is accomplished bymerely pressing own on the push plug with the thumb of the hand holdingthe syringe.

By providing an. automatically returned push plug, the filling anddischarge control device is always in proper position for the dischargeof the contents through the needle, and the user is relieved of the careof proprlp setting said control device. Byprovi ing a thumb operatedplug, the user may hold the syringe and operate the plug the other freeto draw back the pl r. The filling. and discharge control device may beformed as a part of the equipment, or may be sold separately therefromand constitutes a unit in itsef. Y More or less variation of the exactdetails of construction ispossible without departing from the spirit ofvthis invention; I desire,

therefore, not to limit myself to the exact form of the constructionshown and described, but intend, in the following claims, to point outall of the invention disclosed herein.

I claim as new, and desire Letters Patent: o

1; A syringe fillinganddischarge control to secure by 1 device forsyr1nges,eomprising, in combination, a body portion having a. main boretherein, a combined inlet and outlet passage and a discharge passage,opposite thereto and opening to said bore, a ush plug slidably mountedin said bore and aving a discharge passage normally registering withsaid com bined inlet and outlet passage and with said filler tube anddischarge passage of the body portion, and, having an mtake'passageopening from a rminating in a port nor- -*'mally out of register witheither passage of the with the combined inlet and outlet passage bodyportion but adapted to register of said body portion when depressed to ameans for autoplug to normatically restoring said mal positionwhenreleases.

2. A syringe filling and discharge control device for syringes,comprising, in combination, a body portion havin a main bore therein, acombined inlet an outlet passage and a discharge passage opposite,thereto and opening to said bore, a hollow needle secured to the bodyportion at the end of said discharge passage, a push plug slidablymounted in said bore and having means for connection with a liquid,container, said push plug having a discharge passage normally connectingsaid combined inlet and outlet-passage with said discharge pamage of thebody ortion, and having an intake passage opening from a filler tube andterminatmg in a port normally out of register with either passage of thebody portion but adapted to register with said combined inlet and outletpassage of the body portion when depressed to a second position, and acoiled compression spring interposed between said body portion and pushplug, and actin to restore said push' plug to normal position whenreleased 3. In a syringe, the combination with a syringe cylinder andplunger therein, of a fillin and discharge control device, having a yportion -renriovably secured to the discharge end of said syringecylinder, there being a combined inlet and outlet passage in said bodyortion, opening to the mterior of said cylin er, and a discharge passagein said body rtion, and a spring actuated push plug s 'dably mounted ina bore in said body portion and havinga dimharge passag normallyestablishing communication bet een said combined inlet and outletpassage and said discharge'passage of the body portion, and having anintake passage ope'ning from a filler tube and terminating 1n a normallyclosed portarranged to register with said combined inlet and outletpassage when the-push plug is depressed to a second position.

Chicago, March 17, 1924.

. HENRY M. CARSTEKS.

